Digital Media Technology : Real World Applications. June Bicknese. Table of contents. 1. Digital media technology in media production 2. Overview of digital technology and a media server 3. A case study on a production company

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Successive video images have redundant and repeated images. So, compression makes the repeated images be encapsulated in such a way that nearly every piece of redundant content should be expressed once.

Since there are some limitations that human can perceive in visual and auditory systems, digital compression can take advantage of this fact.

Data can be compressed and decompressed without losing any of the original data so that the decompressed data matches the original data exactly.

(2) Lossy compression:

Data is lost during the compression process and cannot be recovered during the decompression. The amount of how much data is lost is depending on what kind of compression scheme is applied to the data.

: If you need small amount of video or audio clips to be played over the network, your web server doesn’t need to have a separate video server. Your web server can accommodate the basic functions of a video server.

Combining a web server and a video server

: If we are considering media production and distribution of the output over the network, we definitely need a video server that has higher quality digital services than the web server.

: It dynamically adjusts the bit rate of streaming video as the network bandwidth changes. It is beneficial for a video to be streamed via networks with different bandwidth over the Internet. However, the quality of the video may be downgraded.

In production area, digital media technology has been used mostly for video editing and commercial playback. A video server is not used for the production.

The closest of using digital technology is the kiosk systems. Kiosk systems are using essential digital media technology. So, kiosk system can be a good example of the current applications for digital technology.

Kiosks are located at the First Union Center. They are used to help the sports fans and audiences get information about the facilities and events. Kiosk touch screens are especially popular during a sports game intermission. During the intermission, people can see the major highlights that just happened during the game.

 The motion-JPEC file is changed into .omfi file. The file is exported from Avid Xpress and imported into Windows Media Cleaner.

• OMFI file as a universal compressed file format

‣ Motion-JPEG has no universal decoding algorithm standard. This means that a motion-JPEG file may produce different results on different applications. In video imaging, transporting a compressed video in its native compression format between different applications may require common denominator.

‣ For this reason, omfi is used as the interchange of digital media data between different platforms or applications. OMFI means Open Media Framework Interchange, a registered trademark of Avid Technology, Inc. It is a standard format of the interchange of digital media data among heterogeneous platforms.

During the game, if there is a memorable moments, the highlight is uploaded into the video server so that audience can see it again during the intermission. This uploading is almost like real-time updating, but it takes about 5 minutes after the actual event.

 All games are recorded into Avid Xpress.

 Once there is a good highlight, it is edited and exported into the Windows Media Cleaner.

 In the Cleaner, encode it as a Windows Media file

 Save it as a Windows Media file and Windows object file.

 Transfer the wvx and wmv files into the two different server machines.

RAID level 5 – RAID 5 allows three or more drives to stripe the data across drives. Even two drives can function well.

Video Naming in the Web and Video Servers

 Video name: team name / show name + purpose + number in order

For example, the first Flyers history video is named as flyhis01.wvx in database and flyhis01.wmv in the video server.

 There are subvideos. These are smaller video files than video files. It is used when somebody comments on a particular game or play that happened. It is played with the main video clip. The processes of uploading and retrieving a subvideo file are same as the video ones.

: RTSP is an application-level protocol for control over the real-time data delivery. It is associated with the port 554. Sources of data can be audio, video, or live data feeds. This protocol is designed to cope with bandwidth-demanding and real-time streams.